package com.rssuper.viewmodel

import androidx.lifecycle.ViewModel
import androidx.lifecycle.viewModelScope
import com.rssuper.repository.FeedRepository
import com.rssuper.state.State
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.StateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class FeedViewModel(
    private val feedRepository: FeedRepository
) : ViewModel() {
    
    private val _feedState = MutableStateFlow<State<List<com.rssuper.database.entities.FeedItemEntity>>>(State.Idle)
    val feedState: StateFlow<State<List<com.rssuper.database.entities.FeedItemEntity>>> = _feedState.asStateFlow()
    
    private val _unreadCount = MutableStateFlow<State<Int>>(State.Idle)
    val unreadCount: StateFlow<State<Int>> = _unreadCount.asStateFlow()
    
    fun loadFeedItems(subscriptionId: String? = null) {
        viewModelScope.launch {
            feedRepository.getFeedItems(subscriptionId).collect { state ->
                _feedState.value = state
            }
        }
    }
    
    fun loadUnreadCount(subscriptionId: String? = null) {
        viewModelScope.launch {
            _unreadCount.value = State.Loading
            try {
                val count = feedRepository.getUnreadCount(subscriptionId)
                _unreadCount.value = State.Success(count)
            } catch (e: Exception) {
                _unreadCount.value = State.Error("Failed to load unread count", e)
            }
        }
    }
    
    fun markAsRead(id: String, isRead: Boolean) {
        viewModelScope.launch {
            try {
                feedRepository.markAsRead(id, isRead)
                loadUnreadCount()
            } catch (e: Exception) {
                _unreadCount.value = State.Error("Failed to update read state", e)
            }
        }
    }
    
    fun markAsStarred(id: String, isStarred: Boolean) {
        viewModelScope.launch {
            try {
                feedRepository.markAsStarred(id, isStarred)
            } catch (e: Exception) {
                _feedState.value = State.Error("Failed to update starred state", e)
            }
        }
    }
    
    fun refreshFeed(subscriptionId: String? = null) {
        loadFeedItems(subscriptionId)
        loadUnreadCount(subscriptionId)
    }
}